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Are you sure you put the correct type of needle in? Normally, if you have any problem, cleaning and oiling will fix it. It sounds like you either didn't tighten the needle screw or you put the wrong type of needle in.
put in a new needle rethread the machine top & bobbin--use every thread guide make sure the zig zag settings are correct it's also possible that the machine could have a worn or damaged gear or cam--which would have to be checked at a sewing machine shop
Sounds like your hook to needle timing is off. When you sew through thick materials, a lot of machines have issues where the needle sticks in the fabric but all the internal parts shift and this causes the hook to needle timing to go out. The begging signs of this is skipping stitches. You will have to have you local independent sewing store do this adjustment for you
Sounds to me like your bobbin case or hook came loose. Maybe your machine is out of time. Were you possibly pulling the material through the machine to hurry things along, or did you let the machine feed it itself? Pulling it through can cause needles to flex and hit the hook area incorrectly, causing the machine to go out of time. Now, if the needle is not going into the needle plate at the correct location ALL the time, that could be a broken needle bar (bad news), or a broken swing bar (really bad news)